Note 9 - Basic and Diluted Loss Per Share (Details Textual) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Number Diluted Shares Outstanding Adjustment, Total	0	0	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	616,751	125,249	77,715
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	629,866	849,660	405,774